Arcjet ships runtime security for coding agents across Claude Code, Codex, Cursor, and Copilot

Announced Oct 8, Arcjet Runtime Security for Coding Agents discovers agents on developer endpoints and applies one Rego policy set across Claude Code, Codex, Cursor, Muse Code, and Copilot through each agent's hooks, with detectors for prompt injection, PII, and high-risk MCP or web destinations. It's available now; Arcjet recommends publishing the starter policies in dry-run for a week before enforcing.